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Not yet recruitingNCT06503029Updated Jul 16, 2024

Evaluate Cytotoxicity, Leaching, and Structural Conformation of Clear Aligners

A Phase 4 interventional study of Invisalign Cleaning Crystals and Fittey Dent Cleaning Tablet in Malocclusion and Cytotoxicity, sponsored by Riyadh Elm University. Not yet recruiting at 1 site in Saudi Arabia. Open to participants aged 21 Years to 40 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2024-07-16.

Sponsored by Riyadh Elm University · Phase 4, Interventional, and Prevention

From the registry’s dates

  • Primary completion was expected by Jan 2025, 1 year 9 months ago, but the record still lists the study as not yet recruiting.
Phase
Phase 4
Study type
Interventional
Enrollment
84
Allocation
Randomized
Ages
21 Years to 40 Years
Sex
All
01

Study summary

The aim is to evaluate clear aligners' cytotoxicity, leaching, and structural properties and compare them with four cleaning tools. The null hypothesis is the cleansers have no impact on the properties tested.

Read the detailed description

Orthodontic Invisalign clear aligners patients will be randomly distributed into four groups using four cleaning methods. Participants will be instructed to clean their trays as instructed by the production company.

Leaching, Cytotoxicity, and Structural Confirmation will be evaluated of the Invisalign clear aligners after being used.

02

Conditions studied

  • Malocclusion
  • Cytotoxicity

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Keywords

  • Cytotoxicity
  • Leaching
  • Clear aligner
  • Orthodontics
03

In context

Malocclusion

323 studies on the registry are indexed under Malocclusion; 85 are open to participants now.

This study's planned enrollment of 84 is above the median of 37 across 242 interventional studies indexed under Malocclusion.

Browse Malocclusion studies →

Lead sponsor

Riyadh Elm University is the lead sponsor of 26 studies on the registry; 10 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
21 Years to 40 Years
Sexes eligible
All
Accepts healthy volunteers
Yes

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • Participants who are on Invisalign Clear aligner treatment.
  • Participants who are 21 years and older and committed to their treatment.
  • Participants with caries-free dentition
  • Participants with no smoking habits
  • Participants are not pregnant females

Exclusion criteria

Exclusion Criteria:

  • Participants who are on Orthognathic treatment.
  • Participants with Hypodontia.
05

Study design

Phase
Phase 4
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Double (Investigator, Outcomes assessor)
Enrollment
84 participants (estimated)

Study arms

  • Experimental
    Invisalign Cleaning Crystals

    Invisalign Cleaning Crystals are used as a cleaning method for orthodontic clear aligners. It includes Sodium Sulfate as an active ingredient.

    Device: Invisalign Cleaning Crystals

  • Experimental
    Fittey Dent Cleaning Tablet

    Fittey Dent Cleaning Tablet is used as a cleaning method for orthodontic clear aligners. It includes Sodium Perborate as an active ingredient.

    Device: Fittey Dent Cleaning Tablet

  • Experimental
    Listeren Mouthwash used as cleaning method

    Listeren Mouthwash is used as a cleaning method for orthodontic clear aligners. It includes Eucalyptol and Menthol as active ingredients.

    Drug: Listeren Mouthwash

  • Active comparator
    Toothbrush and water

    Toothbrush and water is used as a cleaning method for orthodontic clear aligners that as recommended by the aligner manufacturer.

    Device: Toothbrush and Water

Interventions

  • DeviceInvisalign Cleaning Crystals

    Invisalign Cleaning Crystals are used as a cleaning method for orthodontic clear aligners. It includes Sodium Sulfate as an active ingredient.

  • DeviceFittey Dent Cleaning Tablet

    Fittey Dent Cleaning Tablet is used as a cleaning method for orthodontic clear aligners. It includes Sodium Perborate as an active ingredient.

  • DrugListeren Mouthwash

    Listeren Mouthwash is used as a cleaning method for orthodontic clear aligners. It includes Eucalyptol and Menthol as active ingredients.

  • DeviceToothbrush and Water

    Toothbrush and water is used as a cleaning method for orthodontic clear aligners that as recommended by the aligner manufacturer.

06

What researchers measure

Primary outcomes

  1. Cytotoxicity

    Aligners from each of the four groups will be submerged in normal saline for a month at 37°C to conduct a cytotoxicity assessment. Following that, the solutions were diluted to three distinct concentrations (5%, 10%, and 20% volume/volume). After 48 hours of seeding in 96-well microplates, gingival fibroblasts were exposed to the solution, and the medium will be changed to an MTT solution (MTT: 3-\[4,5-dime-thylthiazol-2-yl\]-2,5-diphenyltetrazolium bromide). Then optical density will be measured to ascertain cell viability and subsequently assess cytotoxicity.

    Time frame: 1-2month

  2. Leaching

    Each set of aligners from each of the four groups will be cut into 5x5 mm squares. To accelerate the degradation of the sample, each specimen will be submerged in a single glass vial with an alcoholic media. Each material will be soaked in five different solutions as follows: the first is absolute ethanol (100%), the second is 75% ethanol to 25% water, the third is 50% ethanol to water, the fourth is 25% ethanol to 75% water, and finally, 100% water solution served as the control. A gas chromatography-mass spectrometry unit shall be used to analyze the leached substances in the immersion medium. An Agilent GC 7890A combined with a triple-axis detector 5975 C single quadrupole mass spectrometer will be used for GC-MS analysis

    Time frame: 1-2months

  3. Structural Conformation

    Maxillary and mandibular clear aligners from all four included groups will be cut into 5 × 5 mm squares. Each specimen will be mounted in a plastic mold using an orthodontic plaster to facilitate the indentation process. The microhardness will be tested using a Vickers indenter (INNOVATEST, FALCON 450, Deutschland GmbH) by applying a 25 gf load for 15 s.

    Time frame: 1-2months

07

Study locations

1 site
08

References and documents

Publications

  • Ahrari F, Tavakkol Afshari J, Poosti M, Brook A. Cytotoxicity of orthodontic bonding adhesive resins on human oral fibroblasts. Eur J Orthod. 2010 Dec;32(6):688-92. doi: 10.1093/ejo/cjq019. Epub 2010 Jun 21. PubMed 20570954 ↗
  • Alhendi A, Khounganian R, Almudhi A. Cytotoxicity assessment of different clear aligner systems: An in vitro study. Angle Orthod. 2022 Jun 7;92(5):655-60. doi: 10.2319/121621-919.1. Online ahead of print. PubMed 35666210 ↗
  • Alhendi A, Khounganian R, Almudhi A, Ahamad SR. Leaching of Different Clear Aligner Systems: An In Vitro Study. Dent J (Basel). 2022 Feb 14;10(2):27. doi: 10.3390/dj10020027. PubMed 35200252 ↗
  • Eliades T, Pratsinis H, Athanasiou AE, Eliades G, Kletsas D. Cytotoxicity and estrogenicity of Invisalign appliances. Am J Orthod Dentofacial Orthop. 2009 Jul;136(1):100-3. doi: 10.1016/j.ajodo.2009.03.006. PubMed 19577155 ↗

Individual participant data

Plan to share: No

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jul 16, 2024, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT06503029
Lead sponsor
Riyadh Elm University
Responsible party
Yara AlSenani (Resident, Riyadh Elm University) — Principal investigator
First posted
Jul 16, 2024
Start date
Jul 15, 2024 (estimated)
Primary completion
Jan 25, 2025 (estimated)
Completion
Mar 5, 2025 (estimated)
Last update
Jul 16, 2024

Study contacts

Yara AlSenani, Resident
Contact
yara.a.alsenanai2022@student.riyadh.edu.sa
00966535599141
Omar AlKadhi, BDS,MSc
principal investigator · Associated Professor, Riyadh Elm University.

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is not yet recruiting, as verified in Jul 2024. You cannot join it, but the record below documents what was studied.

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